Process for manufacturing corrosion-resistant seamless titanium alloy tubes and pipes

摘要

A process for manufacturing seamless titanium alloy tubes or pipes having good corrosion resistance and good mechanical properties from a titanium alloy which consists essentially, by weight, of one or more of the platinum group metals in a total amount of 0.01 - 0.14%, at least one of Ni and Co each in an amount of 0.1% - 2.0%, not more than 0.35% of oxygen, not more than 0.30% of iron, optionally at least one of Mo, W, and V each in an amount of 0.1% - 2.0%, and a balance of Ti. The process comprises preparing a billet by hot working after preheating in a temperature range of from 650°C to a temperature 100°C above the beta-transus point and subjecting the billet to tube extrusion after preheating in a temperature range of from 650°C to a temperature 100°C above the beta-transus point, optionally followed by at least one of annealing, cold drawing, and cold or warm rolling.